<md-toolbar color="primary">
  <button md-icon-button type="button" (click)="openSidebar()">
    <!--<md-icon class="md-18|md-24|md-36|md-48">android</md-icon>-->
    <md-icon svgIcon="owl"></md-icon>
  </button>
  <span>material风格的demo</span>
  <span class="fill-remaining-space"></span>
  <!--primary |accent|warn -->
   <md-slide-toggle color="accent" (change)="onChange($event.checked)">黑夜模式</md-slide-toggle> 
</md-toolbar>
